JP6012356B2 - Height adjustment device for motorcycles - Google Patents

Description

  The present invention relates to a vehicle height adjustment device for a motorcycle.

  As described in Patent Document 1, as a vehicle height adjusting device for a motorcycle, the present invention relates to a vehicle height adjusting device using a hydraulic attenuator. The vehicle height is lowered while the vehicle is stopped, and the vehicle height is raised while the vehicle is running. For the vehicle height two-stage adjustment device for this purpose, the hydraulic attenuator is extended by using the expansion / contraction action of the hydraulic attenuator to increase the vehicle height and arbitrarily change the vehicle height to a lower position. Is.

  Specifically, by using the discharge oil generated by the pumping operation of the hydraulic attenuator, the adjustment valve is selected either by a manual operation or by an automatic operation to either increase the vehicle height or decrease the vehicle height. The vehicle height is arbitrarily switched to a predetermined height or a predetermined low.

JP 22-22680

The motorcycle height adjusting device described in Patent Document 1 has the following problems.
(1) The vehicle height is adjusted in two stages, a high position and a low position, and cannot be held at an arbitrary position (intermediate height position) between the high position and the low position.

  An object of the present invention is to enable a vehicle height adjustment device for a motorcycle to hold the vehicle height at an arbitrary intermediate position and to control a switching valve efficiently.

The invention according to claim 1 is provided with a damper tube provided on one of the vehicle body side and the axle side, and provided on the other of the vehicle body side and the axle side, and slides on an oil chamber in the damper tube with respect to the damper tube. A piston rod that expands and contracts, a hydraulic jack provided on one side of the damper tube and the piston rod, a spring receiver supported by a plunger inserted in the jack chamber of the hydraulic jack, and provided on the other side of the damper tube and the piston rod A suspension spring interposed between the spring receiver and a hydraulic pump that pumps and discharges hydraulic oil by the expansion and contraction of the piston rod with respect to the damper tube and supplies the hydraulic oil to the jack chamber of the hydraulic jack. In a motorcycle height adjustment device for a motorcycle that adjusts the vehicle height by extending and contracting the piston rod with respect to the damper tube, The changeover valve switches and controls the changeover valve according to the detection result of the vehicle height detection means, the changeover valve for switching and connecting the vehicle height detection means, the jack chamber of the hydraulic jack, and the oil reservoir chamber communicating with the oil chamber in the damper tube. , have a control means for holding the vehicle height at an arbitrary position, the switching valve comprises four ports 3 position solenoid valve, the discharge check valve and the hydraulic pump is opened by hydraulic oil discharged from the hydraulic pump Lowering the vehicle height with a vehicle height raising position equipped with a suction check valve that opens with the hydraulic fluid being sucked in, a passage communicating the hydraulic pump to the oil reservoir chamber, and a passage communicating the jack chamber of the hydraulic jack to the oil reservoir chamber Selective switching control to any one of three positions: a position, a passage communicating the hydraulic pump with the oil reservoir, and a passage blocking the jack chamber of the hydraulic jack with respect to the oil reservoir chamber Is obtained by way it is.

The invention according to claim 2 is the invention according to claim 1 , wherein the vehicle height detection means is a protrusion height detection means of a plunger in a hydraulic jack.

The invention according to claim 3 is the invention according to claim 1 , wherein the vehicle height detection means is hydraulic pressure detection means of a jack chamber in a hydraulic jack.

According to a fourth aspect of the present invention, in the first aspect of the invention, the vehicle height detecting means is a means for detecting an expansion / contraction stroke length of a piston rod with respect to the damper tube.

According to a fifth aspect of the present invention, there is provided a motorcycle height adjusting device for a motorcycle according to any one of the first to fourth aspects, wherein a display device for displaying a vehicle height state, a control state, vehicle body information, and the like is provided. In addition to displaying the current state, a vehicle height adjustment unit is provided on the display unit so that the vehicle height can be adjusted to an arbitrary position.

The invention according to claim 6 further enables selection of automobile height adjustment and manual vehicle height adjustment in the invention according to claim 5 .

(Claim 1)
(a) In a motorcycle height adjusting device for a motorcycle, a vehicle height detecting means for detecting a vehicle height, a switching valve for switching and connecting a jack chamber of a hydraulic jack and an oil reservoir chamber communicating with an oil chamber in a damper tube; And a control means for controlling the switching of the switching valve according to the detection result of the vehicle height detecting means and holding the vehicle height at an arbitrary position.

  Therefore, the vehicle height can be set at any intermediate height position between the maximum height position determined by the maximum projectable end of the plunger in the hydraulic jack and the minimum height position determined by the minimum retractable end of the plunger in the hydraulic jack. Can be retained.

  (b) By adopting a solenoid valve as a switching valve as vehicle height switching means, the vehicle height can be controlled efficiently by instantaneously switching the switching valve.

( c ) The switching valve comprises a 4-port 3-position solenoid valve, and includes a discharge check valve that opens with hydraulic oil discharged from the hydraulic pump and a suction check valve that opens with hydraulic oil sucked into the hydraulic pump. A vehicle height raising position, a vehicle height lowering position having a passage communicating the hydraulic pump to the oil reservoir and a passage communicating the jack chamber of the hydraulic jack to the oil reservoir, a passage communicating the hydraulic pump to the oil reservoir, and The hydraulic jack is selectively controlled to be switched to any one of three positions of a vehicle height holding position that includes a passage that blocks the jack chamber of the hydraulic jack from the oil reservoir chamber.

  That is, when the vehicle height detecting means detects a certain vehicle height (intermediate height position) and controls the switching valve to the vehicle height holding position while the vehicle is traveling, the hydraulic oil is discharged by the pumping operation. Will not be supplied to the hydraulic jack. Thus, the vehicle height can be held at a predetermined intermediate height position.

(Claim 2 )
( d ) By adopting the protrusion height detection means of the plunger in the hydraulic jack as the vehicle height detection means, the vehicle height at the time of detection can be estimated.

(Claim 3 )
( e ) The vehicle height at the time of detection can be estimated by adopting the hydraulic pressure detection means of the jack chamber in the hydraulic jack as the vehicle height detection means. At this time, the vehicle weight (loading load) can be estimated by applying the detection result of the hydraulic pressure detection means to a filter (low pass). When the vehicle weight is heavy and the vehicle height decreases, the vehicle height is raised to avoid a bumper bump. When the vehicle weight is light and the vehicle height rises, the vehicle height is lowered to avoid extending the damper.

(Claim 4 )
( f ) The vehicle height at the time of detection can be estimated by adopting a means for detecting the extension / contraction stroke length of the piston rod with respect to the damper tube as the vehicle height detection means. At this time, the unevenness condition (amplitude condition) of the road surface can be estimated by applying the detection result of the expansion / contraction stroke length detection means to a filter (bandpass). When the amplitude of the road surface is large, the vehicle height is raised to avoid the bumper bottom collision, or the vehicle height is adjusted to an appropriate height to avoid both the bumper bottom bump and the extension. When the road surface amplitude is small, the vehicle height is lowered to ease wind resistance for an on-road vehicle, and the vehicle height is lowered to prevent the vehicle from shaking back and forth (pitching) for an off-road vehicle.

(Claim 5 )
( g ) In the above-described vehicle height adjustment devices (a) to ( f ), a display device for displaying the vehicle height state, control state, vehicle body information, etc. is provided, and the current state is displayed to the rider and displayed. The vehicle height adjustment part is provided in the part, and the vehicle height can be adjusted to an arbitrary position.

(Claim 6 )
( h ) In the vehicle height adjusting device of ( g ) described above, the vehicle height adjustment and the manual vehicle height adjustment can be selected.

FIG. 1 is a schematic side view showing a motorcycle. 2A and 2B show a vehicle height raising control mode of the rear suspension, where FIG. 2A is a sectional view showing an extension stroke, and FIG. 2B is a sectional view showing a compression stroke. FIG. 3 is a cross-sectional view showing a vehicle height lowering control mode of the rear suspension. FIG. 4 is a cross-sectional view showing a vehicle height holding mode of the rear suspension. FIGS. 5A and 5B show a vehicle height raising control mode of the front fork, where FIG. 5A is a cross-sectional view showing an extension stroke, and FIG. 5B is a cross-sectional view showing a compression stroke. FIG. 6 is a sectional view showing a vehicle height lowering control mode of the front fork. FIG. 7 is a sectional view showing a vehicle height holding mode of the front fork. FIG. 8 is a control circuit diagram showing the vehicle height adjusting device. FIG. 9 is a circuit diagram showing an example of the control circuit. FIG. 10 is a diagram showing an adjustment state of the vehicle height. FIG. 11 is a circuit diagram showing a modification of the control circuit. FIG. 12 is a diagram showing a vehicle height adjustment state. FIG. 13 is a circuit diagram showing a modification of the control circuit. FIG. 14 is a diagram showing an adjustment state of the vehicle height. FIG. 15 is a circuit diagram showing a modification of the control circuit.

  The motorcycle 1 shown in FIG. 1 has a rear suspension 10 interposed between a vehicle body 2 and a rear axle 3 (rear wheel 3A), and a front fork between the vehicle body 2 and the front axle 4 (front wheel 4A). 110 is interposed.

Rear suspension 10 (FIGS. 2 to 4 and FIGS. 8 to 10)
The rear suspension 10 has a damper 10A shown in FIGS. The damper 10A includes a damper tube 11 attached to the vehicle body side and a piston rod 12 attached to the axle side. The piston rod 12 has a suspension spring 13 disposed along the outer periphery of the damper tube 11 and the piston rod 12 by sliding inside the damper tube 11 via the piston 24 to expand and contract with respect to the damper tube 11. A vehicle body side mounting member 14 is fixed to the upper end portion of the damper tube 11, and an axle side mounting member 15 is fixed to the lower end portion of the piston rod 12.

  A hydraulic jack 41 of the rear wheel side vehicle height adjusting device 40 is provided on the outer peripheral portion on the upper end side of the damper tube 11, and a plunger 43 that partitions the jack chamber 42 is inserted into the hydraulic jack 41. The upper end of the suspension spring 13 is supported by the plunger 43, and the lower end of the suspension spring 13 is supported by a spring receiver 16 provided on the axle side attachment member 15.

  The rear suspension 10 includes a damper tube 11 having a double tube made up of an inner tube 21 and an outer tube 22, and a piston 24 fixed to the insertion end of the piston rod 12 into the inner tube 21. The rear suspension 10 forms a lower oil chamber 25A and an upper oil chamber 25B defined by a piston 24 inside the inner tube 21, and forms an oil reservoir chamber 26 on the outer periphery of the outer tube 22, and these oil chambers 25A, The hydraulic oil is stored in the oil reservoir chamber 25B. The oil reservoir chamber 26 always communicates with the lower oil chamber 25 </ b> A or the upper oil chamber 25 </ b> B, and compensates the hydraulic oil corresponding to the volume of the piston rod 12 as the rear suspension 10 expands and contracts.

  The rear suspension 10 has a damping force generator 27 (FIG. 8) in a communication path between a lower oil chamber 25 </ b> A and an upper oil chamber 25 </ b> B provided in the piston 24 of the piston rod 12, and an upper oil chamber provided in the damper tube 11. A damping force generator 28 (FIG. 8) is provided in the communication path between 25B and the oil reservoir chamber 26. The damping force generators 27 and 28 attenuate the expansion and contraction vibrations of the damper tube 11 and the piston rod 12 accompanying the absorption of the impact force from the road surface by the suspension spring 13.

  However, the rear wheel side vehicle height adjusting device 40 is provided with a hydraulic jack 41 on the outer periphery of the outer tube 22 in the damper tube 11 as shown in FIGS. The hydraulic jack 41 includes a plunger 43 that partitions the jack chamber 42. The plunger 43 protrudes from the jack chamber 42 by hydraulic oil supplied to the jack chamber 42 and supports the upper end of the suspension spring 13 on the lower surface thereof.

  The hydraulic jack 41 is provided with an oil return passage 44 in the outer tube 22 for returning the hydraulic oil in the jack chamber 42 to the oil reservoir chamber 26 when the plunger 43 reaches the protruding end protruding from the jack chamber 42 (see FIG. 4).

  The rear wheel side vehicle height adjusting device 40 includes a hydraulic pump 50 that pumps and moves hydraulic oil to and from the jack chamber 42 of the hydraulic jack 41 by the expansion and contraction of the piston rod 12 with respect to the damper tube 11.

  In the hydraulic pump 50, a hollow pipe 51 erected on the end piece 11 </ b> A of the damper tube 11 is slidably inserted into a pump chamber 52 formed by the hollow portion of the piston rod 12.

  The hydraulic pump 50 includes a discharge check valve 53 that discharges the hydraulic oil in the pump chamber 52 that is pressurized by the contraction movement of the piston rod 12 entering the damper tube 11 and the hollow pipe 51 to the hydraulic jack 41 side ( 2 (B)), a suction check valve 54 for sucking the hydraulic oil in the inner tube 21 of the damper tube 11 into the pump chamber 52 where the piston rod 12 becomes negative pressure due to the extension movement of the damper tube 11 and the hollow pipe 51. (FIG. 2A).

  Therefore, the hydraulic pump 50 performs a pumping operation by the expansion and contraction movement of the piston rod 12 to and from the damper tube 11 and the hollow pipe 51 as the vehicle travels and the rear suspension 10 is vibrated by the unevenness of the road surface. When the pump chamber 52 is pressurized by the pumping operation by the contraction movement of the piston rod 12, the oil in the pump chamber 52 opens the discharge check valve 53 and is discharged to the hydraulic jack 41 side. When the pump chamber 52 has a negative pressure due to the pumping operation by the extension movement of the piston rod 12, the oil in the upper oil chamber 25 </ b> B of the damper tube 11 opens the suction check valve 54 and is sucked into the pump chamber 52.

  The rear wheel side vehicle height adjusting device 40 is closed so as to stop the hydraulic oil supplied to the jack chamber 42 of the hydraulic jack 41, or the hydraulic oil is stored in the oil reservoir chamber 26 (the damper tube 11) as shown in FIG. There is a switching valve 60 that opens to discharge to the oil chambers 25A and 25B). The rear wheel side vehicle height adjusting device 40 has a control circuit as shown in FIGS. 8 and 9, and the expansion and contraction movement of the piston rod 12 with respect to the damper tube 11 by the opening / closing control of the switching valve 60 by the ECU (control means) 70. Thus, the hydraulic pump 50 that performs the pumping operation adjusts the liquid level of the hydraulic oil supplied to the jack chamber 42 of the hydraulic jack 41, and thus the protruding height of the plunger 43 protruding from the jack chamber 42, thereby controlling the vehicle height.

Front fork 110 (FIGS. 5 to 7)
The front fork 110 has a damper 110A as shown in FIGS. The damper 110A includes a damper tube 111 attached to the vehicle body side, a bottom tube 112 attached to the axle side, and a piston rod 113. The damper tube 111 is slidably inserted into the bottom tube 112 from the upper end opening of the bottom tube 112. The piston rod 113 is erected at the center inside the bottom tube 112, slides in the oil chamber 125 on the lower end side of the damper tube 111, and expands and contracts with respect to the damper tube 111. A suspension spring 114 is disposed in the oil reservoir chamber 126 on the upper end side of the damper tube 111. A vehicle body side mounting member (not shown) is fixed to the upper end portion of the damper tube 111, and an axle side mounting member 115 is fixed to the lower end portion of the bottom tube 112.

  A hydraulic jack 141 of the front wheel side vehicle height adjusting device 140 is provided at the upper end portion of the damper tube 111, and a plunger 143 that partitions the jack chamber 142 is fitted into the hydraulic jack 141. The upper end of the suspension spring 114 is supported by the plunger 143 via the spring receiver 116, and the lower end of the suspension spring 114 is supported by the end piece / spring receiver 117 provided at the upper end portion of the piston rod 113.

  The front fork 110 is fixedly provided with a piston 124 that slides on the outer periphery of the piston rod 113 on the lower end side of the damper tube 111. The front fork 110 forms a lower oil chamber 125 </ b> A and an upper oil chamber 125 </ b> B defined by the piston 124 on the outer periphery of the piston rod 113, and an oil reservoir chamber 126 on the inner periphery of the piston rod 113 and the upper inner periphery of the damper tube 111. The hydraulic oil is stored in the oil chambers 125 </ b> A and 125 </ b> B and the oil reservoir chamber 126. The oil reservoir chamber 126 always communicates with the lower oil chamber 125 </ b> A or the upper oil chamber 125 </ b> B, and compensates the hydraulic oil corresponding to the volume of the damper tube 111 with the expansion and contraction of the front fork 110.

  The front fork 110 has a damping force generator 127 in a connecting path between a lower oil chamber 125A and an upper oil chamber 125B provided in the piston 124 of the damper tube 111, and a lower oil chamber 125A and an upper oil provided in the piston rod 113. A damping force generator 128 is provided in the communication path between the chamber 125B and the oil reservoir chamber 126. The damping force generators 127 and 128 attenuate the expansion and contraction vibrations of the damper tube 111, the bottom tube 112, and the piston rod 113 accompanying the absorption of the impact force from the road surface by the suspension spring 114.

  However, the front wheel side vehicle height adjusting device 140 is provided with a hydraulic jack 141 at the upper end of the damper tube 111 as shown in FIGS. The hydraulic jack 141 includes a plunger 143 that partitions the jack chamber 142. The plunger 143 protrudes from the jack chamber 142 by the hydraulic oil supplied to the jack chamber 142 and supports the upper end of the suspension spring 114 on the lower surface thereof.

  The hydraulic jack 141 is provided with an oil return passage 144 in the hydraulic jack 141 for returning the hydraulic oil in the jack chamber 142 to the oil reservoir chamber 126 when the plunger 143 reaches the protruding end protruding from the jack chamber 142 (see FIG. 7).

  The front wheel side vehicle height adjusting device 140 has a hydraulic pump 150 that pumps and moves hydraulic oil to and from the jack chamber 142 of the hydraulic jack 141 by the expansion and contraction of the piston rod 113 with respect to the damper tube 111.

  In the hydraulic pump 150, a hollow pipe 151 erected on an end piece 117 of a piston rod 113 is slidably inserted into a pump chamber 152 formed by a hollow portion of a plunger 143.

  The hydraulic pump 150 includes a discharge check valve 153 that discharges the hydraulic oil in the pump chamber 152 that is pressurized by the contraction movement of the piston rod 113 and the hollow pipe 151 entering the damper tube 111 to the hydraulic jack 141 side ( 5 (B)), the piston rod 113 and the hollow pipe 151 are provided with a suction check valve 154 for sucking the hydraulic oil in the oil reservoir chamber 126 into the pump chamber 152 that becomes negative pressure due to the extension movement that retreats from the damper tube 111. 5 (A)).

  Therefore, the hydraulic pump 150 performs a pumping operation by an expansion and contraction motion in which the vehicle travels, the front fork 110 is vibrated by the unevenness of the road surface, and the piston rod 113 and the hollow pipe 151 move back and forth in the damper tube 111. When the pump chamber 152 is pressurized by the pumping operation by the contraction movement of the piston rod 113, the oil in the pump chamber 152 opens the discharge check valve 153 and is discharged to the hydraulic jack 141 side. When the pump chamber 152 has a negative pressure due to the pumping operation by the extension movement of the piston rod 113, the oil in the oil reservoir chamber 126 opens the suction check valve 154 and is sucked into the pump chamber 152.

  The front wheel side vehicle height adjusting device 140 is closed so as to stop the hydraulic oil supplied to the jack chamber 142 of the hydraulic jack 141, or opened so as to discharge the hydraulic oil to the oil reservoir chamber 126 as shown in FIG. A switching valve 160 (not shown) is provided. The front wheel side vehicle height adjusting device 140 has a control circuit similar to that shown in FIGS. 8 and 9 in the rear wheel side vehicle height adjusting device 40, and is controlled by opening / closing control of the switching valve 160 by the ECU (control means) 70. The hydraulic pump 150 that is pumped by the expansion and contraction of the piston rod 113 with respect to the tube 111 adjusts the liquid level of the hydraulic oil supplied to the jack chamber 142 of the hydraulic jack 141, and thus the protruding height of the plunger 143 protruding from the jack chamber 142, Controls the vehicle height.

  The ECU 70 of this embodiment includes a vehicle height detection means 80 (front wheel side vehicle height detection means 80F, rear wheel side vehicle height detection means 80R), a vehicle speed sensor 91 (front wheel vehicle speed sensor 91F, rear wheel vehicle speed sensor 91R), a shift position sensor. The switching valve 60 (or switching valve 160) made up of an electromagnetic valve is turned on / off through detection signals from the 92, G sensor (acceleration / deceleration sensor) 93, side stand sensor 94, engine rotation sensor 95, brake sensor 96, and the like.

  As the vehicle height detection means 80 (front wheel side vehicle height detection means 80F or rear wheel side vehicle height detection means 80R), the protrusion height detection means 81 of the plunger 43 in the hydraulic jack 41 (or the plunger 143 in the hydraulic jack 141), hydraulic pressure One of the hydraulic pressure detection means 82 of the jack chamber 42 (or the jack chamber 142 of the hydraulic jack 141) in the jack 41, one of the expansion / contraction stroke length detection means 83 of the piston rod 12 relative to the damper tube 11 (or the piston rod 113 relative to the damper tube 111), Alternatively, a combination of two or more thereof can be employed.

  Specifically, the protrusion height detection means 81 of the plunger 43 is configured such that, for example, as shown in FIG. 8, a coil 81A is wound around the outer periphery of the hydraulic jack 41, and a cover 81B provided on the plunger 43 is attached to the outer periphery of the hydraulic jack 41. Cover. The protrusion height detecting means 81 changes the impedance of the coil 81A according to the displacement of the plunger 43, and the output of the coil 81A is transmitted to the ECU 70 via the signal processing circuit 81C. The ECU 70 outputs the coil 81A output from the signal processing circuit 81C. Since the vehicle height can be detected by detecting the protrusion height of the plunger 43 at the oscillation frequency, the vehicle height detection means 80 can be integrated with the damper.

  Hereinafter, as the vehicle height adjustment operation of the motorcycle 1, the rear wheel side vehicle height adjustment using the control circuit of FIGS. 8 and 9 using the switching valve 60 comprising a single 2-port 2-position solenoid valve is adopted. The device 40 will be described in detail. The vehicle height adjustment operation by the front wheel side vehicle height adjustment device 140 of the front fork 110 is substantially the same.

  In the vehicle height lowering control mode in which the ECU 70 outputs an ON signal, the switching valve 60 is opened to connect the jack chamber 42 of the hydraulic jack 41 to the oil reservoir chamber 26 of the damper tube 11, so that the hydraulic pump 50 is connected to the hydraulic jack. The hydraulic oil supplied to the jack chamber 42 of 41 is discharged to the oil reservoir chamber 26 to lower the liquid level in the jack chamber 42 and, consequently, the protruding height of the plunger 43, so that the vehicle height can be lowered.

  On the other hand, in the vehicle height raising control mode in which the ECU 70 outputs an off signal, the switching valve 60 is closed to shut off the jack chamber 42 of the hydraulic jack 41 from the oil reservoir chamber 26 of the damper tube 11, and the hydraulic pump 50 is The hydraulic oil supplied to the jack chamber 42 of the hydraulic jack 41 is not discharged, and the vehicle height can be maintained or the vehicle height can be raised. At this time, the hydraulic pump 50 enables the oil in the lower oil chamber 25 </ b> A of the damper tube 11 to be sucked into the pump chamber 52 from the suction check valve 54 by the pumping operation by the above-described extension movement of the piston rod 12. The hydraulic pump 50 supplies the oil in the pump chamber 52 from the discharge check valve 53 to the jack chamber 42 of the hydraulic jack 41 by the pumping operation by the above-described contraction movement of the piston rod 12 so that the vehicle height can be raised.

  The switching valve 60 is a normally closed valve in FIGS. 8 and 9, but may be a normally open valve.

Specifically, the control mode by the rear wheel side vehicle height adjusting device 40 is as follows.
(A) Vehicle Height Lowering Control Mode In the rear wheel side vehicle height adjusting device 40, the ECU 70 is a vehicle that enables the vehicle height raising operation by closing the switching valve 60 when the vehicle is running or stopped for a long time. Under the height raising control mode, the vehicle shifts to a vehicle height lowering control mode in which the switching valve 60 is opened under any one of the following control conditions 1 to 3.

  When the ECU 70 enters the vehicle height lowering control mode and opens the switching valve 60 from the closed state, the ECU 70 applies the initial applied voltage (solenoid valve opening initial voltage E1) when the switching valve 60 is opened from the closed state. In contrast, the applied voltage is lowered to the solenoid valve opening holding voltage E2 in a valve opening holding stage after a certain time from the opening of the valve, and the solenoid current supplied to the switching valve 60 is energy-saving. For example, E1 = 12V and E2 = 4V.

  In addition, when the solenoid is in the closed valve holding state, it can be prevented from malfunctioning due to vibration, etc. by applying a normal voltage (voltage at startup) at regular time intervals, and can be returned from the malfunctioning state. Is possible.

1. Vehicle speed control The ECU 70 enters the vehicle height lowering control mode when the vehicle speed V of the vehicle falls below the vehicle speed lowering vehicle speed Vd (V ≦ Vd), and opens the switching valve 60 to enable the vehicle height lowering operation. .
The ECU 70 determines the vehicle height reduction vehicle speed Vd in advance. For example, Vd is 10 km / h.

2. Predicted stop time control The ECU 70 predicts a predicted stop time T of the vehicle, and enters the vehicle height lowering control mode when the predicted stop predicted time T becomes equal to or less than a predetermined reference stop time Ta (T ≦ Ta). The valve 60 is opened so that the vehicle height can be lowered.

  The ECU 70 calculates the deceleration from the vehicle speed of the vehicle or detects the deceleration from the G sensor, and predicts the estimated stop time T from the deceleration.

  The ECU 70 sets the reference stop time Ta to the discharge time of the hydraulic oil filled in the jack chamber 42 of the hydraulic jack 41 (time to discharge from the jack chamber 42 to the oil reservoir chamber 26 of the damper tube 11 through the switching valve 60). To do.

  At this time, the ECU 70 predetermines a reference vehicle speed Va to start predicting the predicted stop time T of the vehicle, and predicts the predicted stop time T when the vehicle speed V is equal to or lower than the reference vehicle speed Va (V ≦ Va). It shall be.

  Note that the ECU 70 replaces the above-described control conditions T ≦ Ta and V ≦ Va in the predicted stop time control when the vehicle deceleration α is equal to or greater than a predetermined reference deceleration αa (α ≧ αa). The vehicle height lowering control mode may be entered, and the switching valve 60 may be opened to enable the vehicle height lowering operation.

  The ECU 70 determines a reference vehicle speed Va, a reference stop time Ta, and a reference deceleration αa in advance. Va is, for example, 40 km / h, Ta is, for example, 2.5 seconds, and αa is, for example, 4 km / h / sec.

  Note that the estimated stop time is a parameter that represents a time until a running vehicle stops in the near future, which is predicted and calculated from the momentary vehicle motion parameters, and has a time dimension.

  When an actual comparison operation is performed, the time dimension may be divided into both sides of the comparison expression, or may be a comparison operation that does not take the order of “time” at first glance, for example, by comparing each element.

For example, one of the calculation formulas for the simplest stop time prediction is T = −V / α = −V · dt / dV (calculation formula assuming equal acceleration motion). Even if there are differences in the comparison methods due to operational reasons, all of the effective meanings are comparisons of predicted stop times.
T <c (c is a threshold value, here c = Ta)
V <−c · α
-Α> c · V

Further, in the example in which the comparison is performed for each element, the comparison is performed for each element of V and α for calculating the stop time as (V <c1) ∩ (−α> c2) (c1 and c2 are threshold values), and the logical product There are cases, such as taking.
In this case, from T = −V / α, Ta = (− c1) / (− c2) = c1 / C2.

3. The side stand control ECU 70 enters the vehicle height lowering control mode when detecting that the side stand of the vehicle has been changed from the standby position to the working position, and opens the switching valve 60 to enable the vehicle height lowering operation. Also, the vehicle speed is monitored, and if the vehicle speed is above a very low speed (for example, 5 km / s), even if the stand position is at the work position, the lowering control is not performed and the lowering control is performed only when the vehicle speed is 0 Various controls can be performed.

(B) Vehicle Height Raising Control Mode In the rear wheel side vehicle height adjusting device 40, the ECU 70 is one of the following 1 to 4 during the vehicle height lowering control mode in which the switching valve 60 is opened and held according to the above (A). It shifts to the vehicle height raising control mode in which the switching valve 60 is closed according to the control conditions.

  When the ECU 70 enters the vehicle height raising control mode and closes the switching valve 60 from the open state, the ECU 70 turns off the applied voltage E0 to the switching valve 60 (E0 = OV).

1. The vehicle speed control ECU 70 determines when the vehicle speed V exceeds the vehicle speed Vd (V> Vd or V> Vu). Then, the vehicle height lowering control mode is stopped, the vehicle height raising control mode is entered, and the switching valve 60 is closed to enable the vehicle height raising operation.

  The ECU 70 predetermines a vehicle height reduction vehicle speed Vd (or a vehicle height increase vehicle speed Vu). Vd or Vu is 40 km / h, for example.

2. Predicted stop time control The ECU 70 predicts a predicted stop time T of the vehicle. When the predicted stop predicted time T exceeds a predetermined secondary reference stop time Tb (T> Tb), the ECU 70 sets the vehicle height lowering control mode. The vehicle height raising control mode is entered, and the switching valve 60 is closed to enable the vehicle height raising operation.

The ECU 70 predicts the predicted stop time T of the vehicle from the deceleration (or acceleration) of the vehicle.
At this time, the ECU 70 predetermines a secondary reference vehicle speed Vb to start prediction of the vehicle stop time T, and predicts stoppage when the vehicle speed V exceeds the secondary reference vehicle speed Vb (V> Vb). Assume that time T is predicted.

  Note that the ECU 70 changes the vehicle height when the vehicle acceleration β exceeds a predetermined reference acceleration βb (β> βb), instead of the above-described control conditions of T> Tb and V> Vb in the predicted stop time control. The lowering control mode may be stopped, the vehicle height raising control mode may be entered, and the switching valve 60 may be closed to enable the vehicle height raising operation.

  The ECU 70 determines the secondary reference vehicle speed Vb, the secondary reference stop time Tb, and the reference acceleration βb in advance. For example, Vb is 40 km / h, Tb is 3 sec, for example, and βb is 5 km / h / sec, for example.

3. Long-time stop control The ECU 70 stops the vehicle height lowering control mode when the vehicle stop time exceeds the predetermined continuous stop time Tc, enters the vehicle height raising control mode, and closes the switching valve 60. Enable to raise the vehicle.
The ECU 70 determines a continuous stop time Tc of the vehicle in advance. Tc is set to 30 sec, for example.

4). Neutral control The ECU 70 stops the vehicle height lowering control mode when the vehicle speed V = 0 and the shift position is neutral, enters the vehicle height raising control mode, and closes the switching valve 60 to raise the vehicle height. to enable.

(C) Vehicle Height Holding Mode In the rear wheel side vehicle height adjusting device 40, the ECU 70 is in a traveling state of the vehicle, and the switching valve 60 is detected according to the detection result of the vehicle height detection means 80 (rear wheel side vehicle height detection means 80R). By controlling the opening and closing of the vehicle, the vehicle height is held at an arbitrary intermediate height position set in advance as desired.

  That is, the ECU 70 switches the switching valve 60 from the off operation (vehicle height raising control mode) to the on operation, opens the valve, sets the upper threshold value for starting the vehicle height lowering to H1, and the ECU 70 sets the switching valve 60. Is switched from the on operation (vehicle height lowering control mode) to the off operation, and the valve is closed, and the lower threshold value for starting the vehicle height is set to H2. As a result, the ECU 70 holds the vehicle height during traveling of the motorcycle 1 at an intermediate height position between H1 and H2 as shown in FIG. 10 based on the detection result of the vehicle height detection means 80.

  Therefore, according to such a rear wheel side vehicle height adjusting device 40, the vehicle height can be set to the maximum height position determined by the maximum projectable end of the plunger 43 in the hydraulic jack 41 and the minimum immersion of the plunger 43 in the hydraulic jack 41. It can be held at any intermediate height position between the minimum height position defined by the edges.

  In addition, by adopting an electromagnetic valve as the switching valve 60 as vehicle height switching means, the switching valve can be controlled efficiently.

  In addition, the vehicle height at the time of detection can be estimated by employ | adopting the protrusion height detection means 81 of the plunger 43 in the hydraulic jack 41 as the vehicle height detection means 80 (rear wheel side vehicle height detection means 80R).

  Moreover, the vehicle height at the time of detection can be estimated by employ | adopting the hydraulic pressure detection means 82 of the jack chamber 42 in the hydraulic jack 41 as the vehicle height detection means 80 (rear wheel side vehicle height detection means 80R). At this time, the vehicle weight (loading load) can be estimated by applying the detection result of the hydraulic pressure detection means 82 to a filter (low pass). When the vehicle weight is heavy and the vehicle height is low, the vehicle height is raised to avoid the bottom collision of the damper 10A. When the vehicle weight is light and the vehicle height rises, the vehicle height is lowered to avoid extending the damper 10A.

  Further, the vehicle height at the time of detection can be estimated by adopting the expansion / contraction stroke length detection means 83 of the piston rod 12 with respect to the damper tube 11 as the vehicle height detection means 80 (rear wheel side vehicle height detection means 80R). At this time, the unevenness state (amplitude state) of the road surface can be estimated by applying the detection result of the expansion / contraction stroke length detection means 83 to a filter (bandpass). When the amplitude of the road surface is large, the vehicle height is raised to avoid the bottom collision of the damper 10A, or the vehicle height is adjusted to an appropriate height to avoid both the bottom collision of the damper 10A and the extending and cutting. When the road surface amplitude is small, the vehicle height is lowered to ease wind resistance for an on-road vehicle, and the vehicle height is lowered to prevent the vehicle from shaking back and forth (pitching) for an off-road vehicle.

(D) Auxiliary device control mode In the rear wheel side vehicle height adjusting device 40, the ECU 70 uses the detection signal of the rear wheel side vehicle height adjusting means 80R to add an auxiliary device, such as a headlight 210, a side stand 220, and a rearview mirror. 230, the brake 240 with ABS, the display device 250, etc. are controlled as follows.

(Headlight 210)
The ECU 70 adjusts the position, inclination, etc. of the optical axis of the headlight 210 to the optimum state according to the vehicle height, based on the detection signal of the rear wheel side vehicle height detection means 80R. At this time, the ECU 70 passes through the ECU 211 for the headlight 210.

  As a result, no matter how the vehicle height changes, the optical axis of the headlight 210 is changed so as to be an appropriate optical axis according to the vehicle height, and as a result, appropriate lighting for the rider himself The range can be secured, or the possibility of impairing the field of view of the oncoming vehicle can be eliminated.

(Side stand 220)
The ECU 70 adjusts the length of the side stand 220 according to the vehicle height when the vehicle is stopped by the detection signal of the rear wheel side vehicle height detection means 80R. At this time, the ECU 70 passes through the ECU 221 for the side stand 220.

  That is, when the vehicle is stopped at a high vehicle height, the side stand 220 may not reach the vehicle and the vehicle may fall down. Therefore, when the vehicle is stopped at a high vehicle height, the side stand 220 can be extended to stably stop the vehicle. Therefore, the vehicle height at the time of stopping is detected and the length of the side stand 220 is adjusted.

(Rear mirror 230)
The ECU 70 adjusts the position of the rearview mirror 230 according to the vehicle height based on the detection signal of the rear wheel side vehicle height detection means 80R. At this time, the ECU 70 passes through the ECU 231 for the rearview mirror 230.

  That is, no matter how the vehicle height changes, the position of the rearview mirror 230 is changed to an appropriate position according to the vehicle height, and as a result, rearward visual recognition is ensured.

(Brake 240 with ABS)
The ECU 70 adjusts the threshold value of the deceleration change rate of the wheel speed for operating the ABS of the brake 240 according to the vehicle height, based on the detection signal of the rear wheel side vehicle height detection means 80R. At this time, the ECU 70 passes through the ECU 241 for the brake 240 with ABS.
That is, stable braking operability by ABS can be ensured regardless of how the vehicle height changes.

(Display device 250)
The ECU 70 displays the vehicle height on the display device 250 based on the detection signal of the rear wheel side vehicle height detection means 80R. At this time, the ECU 70 causes the display device 250 to display.

  In addition to vehicle height information, the display device 250 has display functions such as vehicle body information, control information, and malfunctions. In addition to the display, the display device 250 can be operated to switch the vehicle height down or to perform automatic / manual operation. It has setting functions such as switching and adjusting the arbitrary vehicle height position, and can be adjusted to the desired control and vehicle height by the rider's operation.

(Spring preload adjustment)
Since the load changes depending on the remaining amount of the fuel gauge, the vehicle height is corrected by a map or damper stroke so that the preload is corrected according to the amount of fuel, or a switch is provided at the rear step to predict two passengers. The preload may be corrected.

  The vehicle height adjusting operation of the rear wheel side vehicle height adjusting device 40 employed in the rear suspension 10 in the motorcycle 1 has been described above, but the front wheel side vehicle height adjusting device 140 employed in the front fork 110 also includes the front wheel side vehicle. Using the detection result of the height detection means 80F, the above-described (A) vehicle height lowering control mode, (B) vehicle height raising control mode, (C) vehicle height holding mode, (D ) The vehicle height adjustment operation can be performed substantially the same as that in the accessory device control mode.

(E) Front / Right Vehicle Height Linkage Control Mode Next, a vehicle height linkage control mode in which the vehicle height adjustment operation of the rear suspension 10 in the motorcycle 1 is linked to the vehicle height adjustment operation by the front fork 100 will be described.

  That is, the rear wheel side vehicle height adjusting device 40 of the rear suspension 10 includes a hydraulic pump 50 that performs a pumping operation by the expansion and contraction of the piston rod 12 and discharges hydraulic oil, and a plunger 43 that protrudes by the hydraulic oil discharged from the hydraulic pump 50. And the suspension spring 13 supported by the plunger 43 of the hydraulic jack 41, and the hydraulic jack 41 is operated and controlled according to the detection result of the rear wheel side vehicle height detection means 80R attached to the rear suspension 10. Adjust the rear wheel side vehicle height.

  Further, the front wheel side vehicle height adjusting device 140 of the front fork 110 includes a hydraulic pump 150 that pumps and discharges hydraulic oil by the expansion and contraction of the piston rod 113, and a plunger 143 that protrudes from the hydraulic oil discharged by the hydraulic pump 150. The hydraulic jack 141 includes a hydraulic jack 141 and a suspension spring 114 supported by the plunger 143 of the hydraulic jack 141. The hydraulic jack 141 is operated and controlled based on the detection result of the front wheel side vehicle height detection means 80F attached to the front fork 110. Adjust the side vehicle height.

  In the motorcycle 1, the rear wheel side vehicle height adjustment operation by the operation control of the hydraulic jack 41 included in the rear wheel side vehicle height adjustment device 40 of the rear suspension 10 and the front wheel side vehicle height adjustment of the front fork 110 are performed. The vehicle height is adjusted in conjunction with the adjustment operation of the front wheel side vehicle height by the operation control of the hydraulic jack 141 included in the device 140. Thereby, even if the vehicle height of the motorcycle 1 changes, the driving posture of the rider can be stabilized.

  Therefore, in the motorcycle 1, the ECU 70 synchronizes the adjustment operation of the rear wheel side vehicle height by the rear wheel side vehicle height adjustment device 40 and the adjustment operation of the front wheel side vehicle height by the front wheel side vehicle height adjustment device 140. The height can be adjusted. As a result, the vehicle body 2 can be displaced vertically parallel to the front and rear axles 3 and 4 so that the stability of the rider's driving posture can be maintained.

  In the motorcycle 1, when the ECU 70 lowers the vehicle height by the rear wheel side vehicle height adjusting device 40 and the front wheel side vehicle height adjusting device 140, the ECU 70 determines the rear wheel side vehicle height by the rear wheel side vehicle height adjusting device 40. The vehicle height can be adjusted by making the lowering operation precede the lowering operation of the front wheel side vehicle height by the front wheel side vehicle height adjusting device 140. As a result, the vehicle height on the rear wheel side can be lowered first, and the footing property when stopping can be improved.

  Moreover, the front turning of the vehicle body 2 can be mitigated by lowering the vehicle body 2 that has already turned forward from the rear wheel side by the brake operation at the time of stopping, and then lowering the front wheel side.

  In the vehicle height interlocking control mode of the rear suspension 10 and the front fork 100, the rear suspension 10 serves as a hydraulic pump that supplies hydraulic oil to the hydraulic jack 41 of the rear suspension 10 and the hydraulic jack 141 of the front fork 100. A hydraulic pump 50 that discharges hydraulic oil by a pumping operation by expansion and contraction may be shared. However, the hydraulic pump 150 in which the front fork 100 is pumped by the expansion and contraction of the piston rod 124 to discharge the hydraulic oil can also be used as a hydraulic pump for interlocking the vehicle height between the rear suspension 10 and the front fork 100 described above. .

  Next, a modified example of the control circuit constituting the rear wheel side vehicle height adjusting device 40 (the same applies to the front wheel side vehicle height adjusting device 140) will be described.

(Variation 1 of the control circuit of the vehicle height adjusting device 40) (FIGS. 11 and 12)
The control circuit of the first modification shown in FIG. 11 of the vehicle height adjusting device 40 is different from the control circuit shown in FIG. 9 in that both the switching valve 60 and the relief valve 61 are provided. The relief valve 61 is located on the discharge path of the pump chamber 52 of the hydraulic pump 50, and a portion closer to the pump chamber 52 than the discharge check valve 53 can be the oil reservoir chamber 26 (oil chambers 25 </ b> A and 25 </ b> B) of the damper tube 11. ) Is connected to the communication path to contact. The ECU 70 controls the relief valve 61 according to the detection result of the vehicle height detection means 80R as described in the following (1) to (4), so that the vehicle height can be held at an arbitrary position.

  Note that the relief valve 61 of the first modification is a two-port two-position solenoid valve that is normally open (but can be normally closed).

  (1) The ECU 70 turns off the switching valve 60 and closes it, and turns on the relief valve 61 and closes it, so that the jack chamber 42 of the vehicle height adjusting device 40 and the pump chamber 52 of the hydraulic pump 50 are closed. The vehicle is raised with respect to the oil reservoir chamber 26 of the damper tube 11 and is raised by the pumping operation of the hydraulic pump 50 (a in FIG. 12).

  (2) With respect to the above (1), when the ECU 70 continues to close with the switching valve 60 turned off, and the relief valve 61 is turned off and opened, the jack chamber 42 of the vehicle height adjusting device 40 becomes a damper. The pump chamber 52 of the hydraulic pump 50 is connected to the oil reservoir chamber 26 of the damper tube 11 while being cut off from the oil reservoir chamber 26 of the tube 11, and the vehicle height is the maximum protruding height set in the above (1). The position or the intermediate height position is maintained (b in FIG. 12).

  (3) In contrast to the above (2), when the ECU 70 turns on the switching valve 60 and opens it (the relief valve 61 can be turned off or turned on), the jack chamber 42 of the vehicle height adjusting device 40 becomes a damper. Connected to the oil reservoir chamber 26 of the tube 11, the liquid level in the jack chamber 42, and thus the protruding height of the plunger 43, is lowered from the height set in the above (2), and the vehicle height is lowered (c in FIG. 12). .

  (4) With respect to the above (3), the ECU 70 turns off the switching valve 60 and closes it, and turns off the relief valve 61 to open the jack chamber 42 of the vehicle height adjusting device 40. Connected to the oil reservoir chamber 26 of the tube 11, the pump chamber 52 of the hydraulic pump 50 is shut off with respect to the oil reservoir chamber 26 of the damper tube 11, and the vehicle is held at the intermediate height position set in the above (3). (D in FIG. 12).

(Modification 2 of the control circuit of the vehicle height adjusting device 40) (FIGS. 13 and 14)
The control circuit of the second modification shown in FIG. 13 of the vehicle height adjusting device 40 is different from the control circuit shown in FIG. The sub switching valve 62 allows the intermediate port Pm provided at the intermediate height position of the jack chamber 42 of the hydraulic jack 41 to selectively communicate with or shut off the oil reservoir chamber 26 of the damper tube 11. The ECU 70 controls the sub switching valve 62 according to the detection result of the rear wheel side vehicle height detection means 80R as described in the following (1) to (5), thereby determining the vehicle height adjustable end at the intermediate height position. .

  The sub-switching valve 62 of the second modification is a two-port two-position solenoid valve that is normally open (but can be normally closed).

  (1) The ECU 70 turns off the switching valve 60 to close it, and turns off the sub-switching valve 62 to open it, so that the liquid level in the jack chamber 42 of the vehicle height adjusting device 40 reaches the intermediate port Pm. Until the vehicle height is raised by the pumping operation of the hydraulic pump 50, the vehicle height adjustable end is held at the intermediate height position defined by the intermediate port Pm (a in FIG. 14).

  (2) With respect to (1), when the ECU 70 continues to close with the switching valve 60 turned off and the sub switching valve 62 is turned on to close the vehicle height, the hydraulic pump 50 pumps the vehicle height as described above (1 ) In the middle port Pm of FIG. 14 (b).

  (3) In contrast to the above (2), the ECU 70 continues to close with the switching valve 60 turned off, and the sub switching valve 62 is turned off to open the jack chamber 42 of the vehicle height adjusting device 40. It is connected to the oil reservoir chamber 26 of the damper tube 11, and the vehicle level is lowered by lowering the liquid level in the jack chamber 42, and hence the protruding height of the plunger 43 from the height set in the above (2) (c in FIG. 14). ).

  (4) After the vehicle height lowering operation in (3) above, the liquid level in the jack chamber 42 of the vehicle height adjusting device 40 reaches the intermediate port Pm, and then the vehicle height is determined by the intermediate port Pm. It is held in the position (d in FIG. 14).

  (5) When the ECU 70 turns on the switching valve 60 and opens it with respect to the above (4), the jack chamber 42 of the vehicle height adjusting device 40 is connected to the oil reservoir chamber 26 of the damper tube 11, and the jack chamber 42 The liquid level, and thus the protruding height of the plunger 43, is lowered from the height set in the above (4), and the vehicle height is lowered (e in FIG. 14).

(Variation 3 of the control circuit of the vehicle height adjusting device 40) (FIG. 15)
The control circuit of the third modification shown in FIG. 15 of the vehicle height adjusting device 40 is different from the control circuit shown in FIG. 9 in that a switching valve 63 instead of the switching valve 60 is used. The switching valve 63 is a four-port three-position solenoid valve, and a discharge check valve 53 that is opened by hydraulic oil discharged from the hydraulic pump 50 and a suction check valve that is opened by hydraulic oil sucked into the hydraulic pump 50. A vehicle height lowering position P2 having a vehicle height raising position P1 having 54, a passage for communicating the hydraulic pump 50 to the oil reservoir chamber 26 of the damper tube 11, and a passage for communicating the jack chamber 42 of the hydraulic jack 41 to the oil reservoir chamber 26. And a vehicle height holding position P3 including a passage communicating the hydraulic pump 50 with the oil reservoir chamber 26 and a passage blocking the jack chamber 42 of the hydraulic jack 41 with respect to the oil reservoir chamber 26. The switching is selectively controlled by (3).

  (1) When the ECU 70 sets the switching valve 63 to the vehicle height raising position P1, the jack chamber 42 of the vehicle height adjusting device 40 and the pump chamber 52 of the hydraulic pump 50 are shut off from the oil reservoir chamber 26 of the damper tube 11, The vehicle height is raised by the pumping operation of the hydraulic pump 50.

  (2) When the ECU 70 sets the switching valve 63 to the vehicle height lowering position P2, the jack chamber 42 of the vehicle height adjusting device 40 is connected to the oil reservoir chamber 26 of the damper tube 11, and the liquid level in the jack chamber 42 and thus the plunger 43 The projecting height of the car is lowered to lower the car height.

  (3) When the ECU 70 sets the switching valve 63 to the vehicle height holding position P3, the jack chamber 42 of the vehicle height adjusting device 40 is shut off from the oil reservoir chamber 26 of the damper tube 11, and the pump chamber 52 of the hydraulic pump 50 is Connected to the oil reservoir 26 of the damper tube 11, the vehicle height is held at the maximum protruding height position or the intermediate height position.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention. For example, the switching valve 60 may be an electrically operable valve of another type such as a rotary type or a poppet type without depending on a solenoid valve.

  The present invention relates to a damper tube provided on one of the vehicle body side and the axle side, and a piston rod provided on the other of the vehicle body side and the axle side, which slides in an oil chamber in the damper tube and expands and contracts with respect to the damper tube. A hydraulic jack provided on one side of the damper tube and the piston rod, a spring receiver supported by a plunger inserted in the jack chamber of the hydraulic jack, and a spring receiver provided on the other side of the damper tube and the piston rod A damper spring having a suspension spring interposed therebetween and a hydraulic pump that discharges hydraulic oil by pumping by the expansion and contraction of the piston rod with respect to the damper tube and supplies the hydraulic oil to the jack chamber of the hydraulic jack. Vehicle height adjustment device for motorcycles that adjusts the vehicle height by the expansion and contraction movement of the piston rod with respect to the vehicle. A switching valve that switches and connects the outlet means, the jack chamber of the hydraulic jack, and the oil reservoir chamber that communicates with the oil chamber in the damper tube, and the switching valve is switched and controlled according to the detection result of the vehicle height detecting means. Control means for holding at an arbitrary position. Thereby, in the vehicle height adjusting device for a motorcycle, the vehicle height can be held at an arbitrary intermediate position, and the vehicle height can be switched instantaneously.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Car body 3 Axle 10 Rear suspension 10A Damper 11 Damper tube 12 Piston rod 13 Suspension spring 16 Spring receiver 25A, 25B Oil chamber 26 Oil reservoir 40 Vehicle height adjustment device 41 Hydraulic jack 42 Jack chamber 43 Plunger 50 Hydraulic pump 60 Switching valve 70 ECU (control means)
80, 80R Vehicle height detection means 81 Projection height detection means 82 Hydraulic pressure detection means 83 Extension stroke length detection means

Claims (6)

A damper tube provided on one of the vehicle body side and the axle side;
A piston rod which is provided on the other of the vehicle body side and the axle side, slides in an oil chamber in the damper tube, and expands and contracts with respect to the damper tube;
A hydraulic jack provided on one side of the damper tube and the piston rod;
A spring receiver supported by a plunger inserted in the jack chamber of the hydraulic jack;
A suspension spring interposed between a damper tube and a spring receiver provided on the other side of the piston rod;
A hydraulic pump that pumps and discharges hydraulic oil by the expansion and contraction of the piston rod with respect to the damper tube, and supplies the hydraulic oil to the jack chamber of the hydraulic jack;
In a motorcycle height adjusting device for a motorcycle that adjusts the vehicle height by extending and contracting the piston rod with respect to the damper tube,
Vehicle height detection means for detecting vehicle height;
A switching valve that switches between a jack chamber of a hydraulic jack and an oil reservoir chamber communicating with the oil chamber in the damper tube;
Detection result by then switching control of the switching valve of the vehicle height detecting means, have a control means for holding the vehicle height at an arbitrary position,
The switching valve is a four-port three-position solenoid valve, and includes a discharge check valve that opens with hydraulic oil discharged from a hydraulic pump, and a suction check valve that opens with hydraulic oil sucked into the hydraulic pump. A vehicle height lowering position having a raised position, a passage communicating the hydraulic pump to the oil sump chamber and a passage communicating the jack chamber of the hydraulic jack to the oil sump chamber, a passage communicating the hydraulic pump to the oil sump chamber, and a hydraulic jack A vehicle height adjusting device for a motorcycle, wherein the vehicle height adjusting device is selectively switched to one of three vehicle height holding positions including a passage for blocking the jack chamber from the oil reservoir chamber . The vehicle height adjusting device for a motorcycle according to claim 1, wherein the vehicle height detecting means is means for detecting a protrusion height of a plunger in a hydraulic jack. The vehicle height adjusting device for a motorcycle according to claim 1, wherein the vehicle height detecting means is a hydraulic pressure detecting means for a jack chamber in a hydraulic jack. The vehicle height adjusting device for a motorcycle according to claim 1, wherein the vehicle height detecting means is means for detecting a length of expansion / contraction stroke of the piston rod with respect to the damper tube. The vehicle height adjustment device for a motorcycle according to any one of claims 1 to 4 , further comprising a display device for displaying a vehicle height state, a control state, information on a vehicle body, etc., and displaying a current state to a rider. A vehicle height adjusting device for a motorcycle provided with a vehicle height adjusting unit on the display unit so that the vehicle height can be adjusted at an arbitrary position. The vehicle height adjustment device for a motorcycle according to claim 5 , wherein the vehicle height adjustment and the manual vehicle height adjustment can be selected.

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